diff --git a/rules/manager.go b/rules/manager.go
index 93ad6475b..a37f742eb 100644
--- a/rules/manager.go
+++ b/rules/manager.go
@@ -65,7 +65,7 @@ type Metrics struct {
 	groupRules          *prometheus.GaugeVec
 }
 
-// NewGroupMetrics makes a new Metrics and registers them with the provided registerer,
+// NewGroupMetrics creates a new instance of Metrics and registers it with the provided registerer,
 // if not nil.
 func NewGroupMetrics(reg prometheus.Registerer) *Metrics {
 	m := &Metrics{